Partial Parallel Interference Cancellation for MC-CDMA Uplink Systems in the Presence of Residual Frequency Offset

• Main Authors: Chun-Kai Yang, 楊鈞凱
• Other Authors: Chin-Liang Wang
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/71434509981850530289

碩士 === 國立清華大學 === 通訊工程研究所 === 94 === In this thesis, we present a compensation scheme for residual frequency offset (RFO) caused by the synchronization errors, where the improved partial parallel interference cancellation (PPIC) detector proposed by Wang et al. is used to eliminate the multiple access interference (MAI) simultaneously. Besides, we also use a subset of the Walsh-Hadamard code as spreading codes to eliminate intercarrier interference (ICI) introduced by RFO. Based on the selection of the Walsh-Hadamard code, the improved PPIC can reduce ICI without increasing implementation complexity. Computer simulation results show that the proposed compensation scheme with a subset of the Walsh-Hadamard code for the improved PPIC detector can effectively enhance the system performance.